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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c60cef95c0749c3f19c113d8edb6f8972755ea207e12c4adc3b0541e7968bc62' 
  AND token = 'E4XY4S2jopzI2Z0tl+CGOGZpamT4pu9ScKGHNQ4cSbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}